Cassiterite is a tin oxide and it is the primary ore of tin. Since early times and still to this day, Cassiterite has been the most popular source for tin. The mineral name, 'cassiterite', originated from a Greek word meaning 'tin', 'kassiteros'. As a result, it is commonly referred to as the 'tin stone'. Though Cassiterite is quite abundant in rough mineral form, transparent gemstone quality material is exceptionally rare.
Owing to its rarity, Cassiterite is considered a collector's stone. Most cassiterite occurs brownish to black, but brighter colors can also occur depending on crystal impurities. Cassiterite mineral deposits can be found in locations all over the world with Bolivia having thought to have the best gem-quality deposits.
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